Abstract
Microstructures of sagittae and lapilli were examined in relation to somatic growth for reared larvae and juveniles of Pacific cod. The Laird-Gompertz model was fitted to the daily age and somatic growth relationship. Growth increments were deposited on a daily basis in both kinds of otoliths, with a check formed at hatching. Two subsequent checks and an accessory primordia (AP) occurred in the sagittae. The lapillus was adequate for increment width measurement through the early life stages. Sagittal and frontal plane of sagitta was adequate for measurement in the pre-AP and post-AP formation stages, respectively. The shift of desirable plane was caused by changes in otolith and increment shapes with AP formation. Back-calculated total lengths using the biological intercept method did not significantly differ with certain body lengths (P>0.05), suggesting validity of back-calculation in this species. Using the back-calculated total length, morphological and ecologic changes that seemed to affect checks and AP formations are discussed.
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Narimatsij, Y., Hattori, T., Ueda, Y. et al. Somatic growth and otolith microstructure of larval and juvenile pacific cod Gadus macrocephalus . Fish Sci 73, 1257–1264 (2007). https://doi.org/10.1111/j.1444-2906.2007.01463.x
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DOI: https://doi.org/10.1111/j.1444-2906.2007.01463.x